Cysts are usually noncancerous and have a sac-like structure that can contain fluid, pus, or gas. Cysts are common and can occur anywhere on the body. Cysts are often caused by infection, clogging of sebaceous glands, or around earrings.
If a cyst does cause symptoms, you may have pressure, bloating, swelling, or pain in the lower abdomen on the side of the cyst. This pain may be sharp or dull and may come and go. If a cyst ruptures, it can cause sudden, severe pain.
True sebaceous cysts arise from hair follicles, whereas epidermoid cysts develop from skin cells. Sebaceous cysts often occur after a hair follicle becomes swollen. The cysts originate from the sebaceous glands, the glands that secrete the oily matter (sebum) that helps to lubricate the skin and the hair.